HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

Describe the function of a transistor as an amplifier with the neat circuit diagram. Sketch the input and output wave forms.

Assuming V_CEsat = 0.2 V and β = 50, find the minimum base current (I_B) required to drive the transistor given in the figure to saturation.

A transistor of α = 0.99 and V_BE = 0.7 V is connected in the common-emitter configuration as shown in the figure. If the transistor is in the saturation region, find the value of collector current.

In the circuit shown in the figure, the BJT has a current gain (β) of 50. For an emitter-base voltage V_EB = 600 mV, calculate the emitter-collector voltage V_EC (in volts).

The technology used for stopping the brain from processing pain is ____________.

The gravitational waves were theoretically proposed by ____________.

Comment on the recent advancement in medical diagnosis and therapy.

What is meant by coherent sources?

Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?

An electric dipole is placed at an alignment angle of 30° with an electric field of 2 × 10⁵ NC^-1. It experiences a torque equal to 8 Nm. The charge on the dipole if the dipole length is lcm is ______.

Define ‘electric dipole’.

Give the expression for the magnitude of its electric dipole moment and the direction.

Write the general definition of electric dipole moment for a collection of point charge.

Calculate the electric field due to a dipole on its axial line and equatorial plane.

Derive an expression for the torque experienced by a dipole due to a uniform electric field.

Consider an electron travelling with a speed V_Φ and entering into a uniform electric field `vec"E"` which is perpendicular to `vec"V"_0` as shown in the Figure. Ignoring gravity, obtain the electron’s acceleration, velocity and position as functions of time.

State Kirchhoff’s current rule.

State Kirchhoff ’s voltage rule.

State the principle of potentiometer.

State and explain Kirchhoff’s rules.